The information received from Toyota is in line with other information from car manufacturers and dealerships. Not true. According to Toyota website, the tow package includes a larger radiator, larger alternator, and a larger transmission cooler, wiring as well as a stiff frame for mounting the hitch. It does not include a hitch but just sticking one on a standard Highlander might cause some serious problems. Look elsewhere for correct information.
I know nothing about Toyotas and I got that information from about a 2-minute Google search. So put a little effort into it before trying to use this non-tow vehicle as a tow vehicle.
'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition
'14 Denali XL